EP1247020A1 - Fuel supply system for an internal combustion engine with a hybrid fuel pump - Google Patents

Fuel supply system for an internal combustion engine with a hybrid fuel pump

Info

Publication number
EP1247020A1
EP1247020A1 EP00988691A EP00988691A EP1247020A1 EP 1247020 A1 EP1247020 A1 EP 1247020A1 EP 00988691 A EP00988691 A EP 00988691A EP 00988691 A EP00988691 A EP 00988691A EP 1247020 A1 EP1247020 A1 EP 1247020A1
Authority
EP
European Patent Office
Prior art keywords
fuel
internal combustion
combustion engine
fuel pump
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00988691A
Other languages
German (de)
French (fr)
Inventor
Kurt Frank
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1247020A1 publication Critical patent/EP1247020A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/06—Feeding by means of driven pumps mechanically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0265—Pumps feeding common rails

Definitions

  • the invention relates to a fuel supply system for internal combustion engines with an electrically driven fuel pump, the suction side of the fuel pump being hydraulically connected to a fuel tank and the pressure side of the fuel pump being hydraulically connected to the internal combustion engine.
  • an electrically driven fuel pump requests the fuel from the fuel tank to the internal combustion engine.
  • the fuel pump must be designed for the entire operating life of the internal combustion engine. This means that when the internal combustion engine is started with a weak battery or when it is very cold, the demand of the fuel pump is significantly reduced because the
  • the invention has for its object to provide a fuel supply system with improved operating behavior compared to the prior art.
  • Fuel supply system for internal combustion engines with an electrically driven fuel pump the suction side of the fuel pump being hydraulically connected to a fuel tank, the pressure side of the fuel pump being connected to the
  • Internal combustion engine is hydraulically connected and the fuel pump is alternatively driven by the internal combustion engine.
  • the hybrid drive of the fuel pump enables the advantages of both drive systems to be used without having to buy their disadvantages.
  • the fuel pump is electrically driven, so that despite the low crankshaft speed of the internal combustion engine, a sufficient flow of demand is achieved and the internal combustion engine is thus supplied with fuel sufficiently quickly. This results in good starting behavior and a low load on the starter battery and starter.
  • the drive of the fuel pump is taken over by the internal combustion engine.
  • the speed of the fuel pump is directly related to the speed of the Internal combustion engine coupled. This results in a better match between the demand flow of the fuel pump and the fuel consumption of the internal combustion engine. This corresponds to a demand for fuel.
  • the direct drive of the fuel pump also increases the efficiency, since there is no conversion of the drive power via the alternator and the electric drive.
  • the electric drive of the fuel pump is a brushless electric motor, so that as soon as this drive is switched off and the fuel pump is driven by the internal combustion engine, it can run with no significant power loss.
  • Fuel supply system In addition, this embodiment provides particularly low-noise operation when the fuel pump is driven by the internal combustion engine.
  • the electric drive is still functional at half the rated voltage of the on-board electrical system, so that even if the starter battery is weak or its performance is reduced due to low temperatures, the fuel pump can still perform adequately.
  • This design is harmless insofar as the fuel pump is only electrically driven during the starting processes and not during the entire operating time of the Internal combustion engine.
  • the operating time of the electric drive is reduced to a fraction of the operating time of the internal combustion engine, so that no overload occurs even when the electric drive is operated for a short time with the nominal voltage of the vehicle electrical system.
  • a first freewheel is arranged between the electric drive of the fuel pump and the fuel pump, and that a second freewheel is arranged between the internal combustion engine and the fuel pump, so that the fuel pump either from the electric drive or from the Internal combustion engine is driven and there can be no reversal of the power flow, for example from the fuel pump to the internal combustion engine or from the fuel pump to the electric drive. This increases operational safety and minimizes the energy required for the fuel pump.
  • Alternator drive or the high-pressure fuel pump of a fuel injection system takes place, so that an optimal adjustment of the demand of the fuel pump is possible.
  • the camshaft only rotates at half the crankshaft speed, so that, depending on which shaft the fuel pump is driven by, the speed differs by a factor of 2.
  • the ratio of the engine and fuel pump speeds can be selected almost continuously. Another criterion for the choice of the drive of the internal combustion engine
  • Fuel pumps can also be the structural conditions in the area of the internal combustion engine or the simplest possible assembly.
  • a fuel pump 1 is hydraulically connected on its suction side 3 to a fuel tank 5 via a first low-pressure fuel line 7.
  • the pressure side 9 of the fuel pump 1 is hydraulically connected to a fuel injection pump 13 of an internal combustion engine 15 via a second low-pressure fuel line 11. Excess fuel required by the fuel pump 1 to the internal combustion engine 15 is fed back to the fuel tank 5 via a return line 17.
  • the fuel pump 1 is alternatively driven by an electric drive 19 or an output shaft 21 of the injection pump 13.
  • a first freewheel 23 is provided between the electric drive 19 and the fuel pump 1.
  • a second freewheel 25 is provided between the internal combustion engine 15 or the output shaft 21 of the injection pump 13 and the fuel pump 1. The freewheels 23 and 25 prevent the fuel pump 1 from being driven simultaneously by the internal combustion engine 15 and the electric drive 19. In addition, a reversal of the power flow from the fuel pump 1 to
  • the electric drive 19 is activated when the internal combustion engine 15 is started. This is the
  • the electric drive 19 is switched off and the fuel pump 1 is driven by the internal combustion engine 15.
  • the fuel supply system according to the invention leads to very good starting behavior of the internal combustion engine 15 even under difficult conditions and one Reduction of the drive power requirement of the fuel pump 1 during the operation of the internal combustion engine 15, so that the fuel consumption of the internal combustion engine 15 decreases accordingly.
  • the fuel pump Due to the significantly reduced operating time of the electric drive compared to the operating time of the internal combustion engine, it can be designed in such a way that it is still functional even at approximately half the rated voltage of the vehicle electrical system. As a result, even if the starter battery is weak or its performance is reduced due to low temperatures, the fuel pump still delivers sufficient power.
  • the engine-side drive of the fuel pump 1 by means of an output shaft 21 of the fuel injection pump 13 is only one possibility of driving many.
  • the fuel pump 1 can also be driven on the internal combustion engine side by the camshaft, the crankshaft, a toothed belt, a V-belt, a timing chain, the water pump or alternator drive.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention relates to a fuel supply system for an internal combustion engine with a fuel pump (1) that can be operated either by an electric drive (19) or by the internal combustion engine (15). The inventive system allows for a good starting behavior of the internal combustion engine (15) and a low power requirement of the fuel pump (1) during the operation of the internal combustion engine (15).

Description

Kraftstoffversorgungssystem für eine Brennkraftmaschine mit hybrid angetriebener KraftstoffpumpeFuel supply system for an internal combustion engine with a hybrid fuel pump
Stand der TechnikState of the art
Die Erfindung geht aus von einem Kraftstoffversorgungssystem für Brennkraftmaschinen mit einer elektrisch angetriebenen Kraftstoffpumpe, wobei die Saugseite der Kraftstoffpumpe hydraulisch mit einem Kraftstofftank in Verbindung steht und wobei die Druckseite der Kraftstoffpumpe mit der Brennkraftmaschine hydraulisch in Verbindung steht.The invention relates to a fuel supply system for internal combustion engines with an electrically driven fuel pump, the suction side of the fuel pump being hydraulically connected to a fuel tank and the pressure side of the fuel pump being hydraulically connected to the internal combustion engine.
Bei diesem bekannten Kraftstoffversorgungssystem fordert eine elektrisch angetriebene Kraftstoffpumpe den Kraftstoff vom Kraftstofftank zur Brennkraftmaschine. Der elektrische Antrieb derIn this known fuel supply system, an electrically driven fuel pump requests the fuel from the fuel tank to the internal combustion engine. The electric drive of the
Kraftstoffpumpe muss für die gesamte Betriebsdauer der Brennkraftmaschine ausgelegt werden. Dies bedeutet, dass beim Starten der Brennkraftmaschine mit schwacher Batterie oder bei großer Kälte die Forderleistung der Kraftstoffpumpe deutlich verringert ist, da dieThe fuel pump must be designed for the entire operating life of the internal combustion engine. This means that when the internal combustion engine is started with a weak battery or when it is very cold, the demand of the fuel pump is significantly reduced because the
Spannung im Bordnetz gegenüber der Nennspannung auf etwa 50 % absinkt. Infolgedessen ist die Kraftstoffversorgung der Brennkraftmaschine und somit auch deren Startverhalten nicht optimal. Außerdem ist, da die bekannten elektrischen Antriebe nicht geregelt sind, der Forderstrom der Kraftstoffpumpe stets gleich dem maximal erforderlichen Kraftstoffström. Im Leerlauf oder bei Teillast wird der überschüssige Kraftstoff über eine Rucklaufleitung in den Kraftstofftank zurückgeführt. Daraus ergibt sich ein unnötig hoher Verbrauch an elektrischer Energie zum Antrieb der Kraftstoffpumpe. Schließlich werden der elektrische Antrieb und die Kraftstoffpumpe unnötig teuer.Voltage in the vehicle electrical system drops to about 50% compared to the nominal voltage. As a result, the fuel supply to the internal combustion engine and thus its starting behavior are not optimal. In addition, since the known electric drives are not regulated are, the demand flow of the fuel pump always equal to the maximum required fuel flow. At idle or at partial load, the excess fuel is returned to the fuel tank via a return line. This results in an unnecessarily high consumption of electrical energy for driving the fuel pump. Eventually, the electric drive and the fuel pump become unnecessarily expensive.
Es ist auch bekannt, eine Kraftstoffpumpe direkt mit der Brennkraftmaschine zu koppeln und von dieser anzutreiben. Der Vorteil bei diesem Antriebskonzept liegt darin begründet, dass die Forderleistung der Kraftstoffpumpe ungefähr proportional zur Drehzahl der Brennkraftmaschine und damit auch ungefähr proportional zum Kraftstoffverbrauch der Brennkraftmaschine ist. Damit kann der Kraftstoffström, der über eine Rucklaufleitung in den Tank zurückgeführt wird, und somit auch die Antriebsleitung der Kraftstoffpumpe deutlich verringert werden. Nachteilig an diesem Antriebskonzept ist allerdings, dass die Kraftstoffpumpe bei Anlassen der brennkraftmaschine nur einen sehr geringen Forderstrom bereitstellt, so dass es einiger Kurbelwellenumdrehungen der Brennkraftmaschine bedarf, um beispielsweise den erforderlichen Druckaufbau im Kraftstoffeinspritzsystem der Brennkraftmaschine zu erreichen. Daraus resultiert ein schlechtes Startverhalten. Ein weiterer Nachteil dieses Systems ist, dass bei leergefahrenem Tank oder bei der ersten Füllung des Tanks im Herstellerwerk der Anlasser der Brennkraftmaschine lange betätigt werden muss, um die erforderliche Kraftstoffforderung zu erreichen. Daraus resultieren hohe Belastungen sowohl der Batterie als auch des Anlassers. Der Erfindung liegt die Aufgabe zugrunde, ein Kraftstoffversorgungssystem mit gegenüber dem Stand der Technik verbessertem Betriebsverhalten bereitzustellen.It is also known to couple a fuel pump directly to the internal combustion engine and to drive it. The advantage of this drive concept lies in the fact that the demand of the fuel pump is approximately proportional to the speed of the internal combustion engine and thus also approximately proportional to the fuel consumption of the internal combustion engine. The fuel flow, which is returned to the tank via a return line, and thus the drive line of the fuel pump can thus be significantly reduced. A disadvantage of this drive concept, however, is that the fuel pump provides only a very small flow of demand when the internal combustion engine is started, so that it takes a few crankshaft revolutions of the internal combustion engine in order, for example, to achieve the required pressure build-up in the fuel injection system of the internal combustion engine. This results in poor starting behavior. Another disadvantage of this system is that when the tank is empty or when the tank is filled for the first time in the manufacturer's plant, the starter of the internal combustion engine has to be operated for a long time in order to achieve the required fuel requirement. This results in high loads on both the battery and the starter. The invention has for its object to provide a fuel supply system with improved operating behavior compared to the prior art.
Diese Aufgabe wird erfmdungsgemaß gelost durch einThis task is solved according to the invention by a
Kraftstoffversorgungssystem für Brennkraftmaschinen mit einer elektrisch angetriebenen Kraftstoffpumpe, wobei die Saugseite der Kraftstoffpumpe hydraulisch mit einem Kraftstofftank m Verbindung steht, wobei die Druckseite der Kraftstoffpumpe mit derFuel supply system for internal combustion engines with an electrically driven fuel pump, the suction side of the fuel pump being hydraulically connected to a fuel tank, the pressure side of the fuel pump being connected to the
Brennkraftmaschine hydraulisch in Verbindung steht und wobei die Kraftstoffpumpe alternativ von der Brennkraftmaschine angetrieben wird.Internal combustion engine is hydraulically connected and the fuel pump is alternatively driven by the internal combustion engine.
Vorteile der ErfindungAdvantages of the invention
Durch den Hybridantrieb der Kraftstoffpumpe können die Vorteile beider Antriebssysteme genutzt werden, ohne deren Nachteile m Kauf nehmen zu müssen. Beim Start der Brennkraftmaschine wird die Kraftstoffpumpe elektrisch angetrieben, so dass trotz geringer Kurbelwellendrehzahl der Brennkraftmaschine ein ausreichender Forderstrom erreicht wird und somit die Versorgung der Brennkraftmaschine mit Kraftstoff ausreichend schnell erfolgt. Daraus resultiert ein gutes Startverhalten sowie eine geringe Belastung von Starterbatterie und Anlasser. Diese Vorteile kommen auch bei der ersten Füllung des Kraftstofftanks beim Kfz-Hersteller oder bei leergefahrenem Kraftstofftank zum Tragen.The hybrid drive of the fuel pump enables the advantages of both drive systems to be used without having to buy their disadvantages. When the internal combustion engine starts, the fuel pump is electrically driven, so that despite the low crankshaft speed of the internal combustion engine, a sufficient flow of demand is achieved and the internal combustion engine is thus supplied with fuel sufficiently quickly. This results in good starting behavior and a low load on the starter battery and starter. These advantages also come into play when the vehicle manufacturer fills the fuel tank for the first time or when the fuel tank is empty.
Sobald die Brennkraftmaschine mit ausreichend hoher Drehzahl lauft, wird der Antrieb der Kraftstoffpumpe von der Brennkraftmaschine übernommen. Dadurch ist die Drehzahl der Kraftstoffpumpe direkt an die Drehzahl der Brennkraftmaschine gekoppelt. Damit wird eine bessere Übereinstimmung des Forderstroms der Kraftstoffpumpe und des Kraftstoffverbrauchs der Brennkraftmaschine erreicht. Dies entspricht einer bedarfsgerechten Kraftstoffforderung . Außerdem wird vermieden, dass große Teile des Kraftstoffforderstroms über eine Rucklaufleitung in den Kraftstofftank zurückgeführt werden. Durch den direkten Antrieb der Kraftstoffpumpe erhöht sich außerdem der Wirkungsgrad, da die Umwandlung der Antriebsleistung über die Lichtmaschine und den elektrischen Antrieb entfallt.As soon as the internal combustion engine runs at a sufficiently high speed, the drive of the fuel pump is taken over by the internal combustion engine. As a result, the speed of the fuel pump is directly related to the speed of the Internal combustion engine coupled. This results in a better match between the demand flow of the fuel pump and the fuel consumption of the internal combustion engine. This corresponds to a demand for fuel. In addition, it is avoided that large parts of the fuel flow are returned to the fuel tank via a return line. The direct drive of the fuel pump also increases the efficiency, since there is no conversion of the drive power via the alternator and the electric drive.
In Ergänzung der Erfindung ist vorgesehen, dass der elektrische Antrieb der Kraftstoffpumpe ein burstenloser Elektromotor ist, so dass, sobald dieser Antrieb stromlos geschaltet wird und die Kraftstoffpumpe von der Brennkraftmaschine angetrieben wird, ohne nennenswerte Verlustleistung mitlaufen kann. Daraus resultiert ein besonders einfacher und kostengünstiger Aufbau des erfindungsgemaßenIn addition to the invention, it is provided that the electric drive of the fuel pump is a brushless electric motor, so that as soon as this drive is switched off and the fuel pump is driven by the internal combustion engine, it can run with no significant power loss. This results in a particularly simple and inexpensive construction of the inventive
Kraftstoffversorgungssystems. Außerdem ist bei dieser Ausfuhrungsform ein besonders gerauscharmer Betrieb gegeben, wenn die Kraftstoffpumpe von der Brennkraftmaschine angetrieben wird.Fuel supply system. In addition, this embodiment provides particularly low-noise operation when the fuel pump is driven by the internal combustion engine.
Bei einer Variante der Erfindung ist vorgesehen, dass der elektrische Antrieb bei halber Nennspannung des Bordnetzes noch funktionsfähig ist, so dass, selbst wenn die Starterbatterie schwach ist oder aufgrund niedriger Temperaturen ihre Leistungsfähigkeit reduziert ist, noch eine ausreichende Forderleistung der Kraftstoffpumpe erzielt wird. Diese Auslegung ist insofern unbedenklich, als die Kraftstoffpumpe nur wahrend der Startvorgange elektrisch angetrieben wird und nicht wahrend der gesamten Betriebsdauer der Brennkraftmaschine. Dadurch verringert sich die Betriebsdauer des elektrischen Antriebs auf einen Bruchteil der Betriebsdauer der Brennkraftmaschine, so dass auch beim kurzzeitigen Betrieb des elektrischen Antriebs mit der Nennspannung des Bordnetzes noch keine Überlastung eintritt.In a variant of the invention, it is provided that the electric drive is still functional at half the rated voltage of the on-board electrical system, so that even if the starter battery is weak or its performance is reduced due to low temperatures, the fuel pump can still perform adequately. This design is harmless insofar as the fuel pump is only electrically driven during the starting processes and not during the entire operating time of the Internal combustion engine. As a result, the operating time of the electric drive is reduced to a fraction of the operating time of the internal combustion engine, so that no overload occurs even when the electric drive is operated for a short time with the nominal voltage of the vehicle electrical system.
Bei weiteren Varianten der Erfindung ist vorgesehen, dass zwischen dem elektrischen Antrieb der Kraftstoffpumpe und der Kraftstoffpumpe ein erster Freilauf angeordnet ist, sowie, dass zwischen der Brennkraftmaschine und der Kraftstoffpumpe ein zweiter Freilauf angeordnet ist, so dass die Kraftstoffpumpe entweder vom elektrischen Antrieb oder von der Brennkraftmaschine angetrieben wird und es nicht zu einer Umkehr des Leistungsflusses, beispielsweise von der Kraftstoffpumpe auf die Brennkraftmaschine oder von der Kraftstoffpumpe auf den elektrischen Antrieb, kommen kann. Dadurch wird die Betriebssicherheit erhöht und der Energiebedarf für die Kraftstoffpumpe minimiert .In further variants of the invention it is provided that a first freewheel is arranged between the electric drive of the fuel pump and the fuel pump, and that a second freewheel is arranged between the internal combustion engine and the fuel pump, so that the fuel pump either from the electric drive or from the Internal combustion engine is driven and there can be no reversal of the power flow, for example from the fuel pump to the internal combustion engine or from the fuel pump to the electric drive. This increases operational safety and minimizes the energy required for the fuel pump.
Weitere Ausgestaltungen der Erfindung sehen vor, dass der Antrieb der Kraftstoffpumpe brennkraftmaschmenseitig von der Nockenwelle, derFurther refinements of the invention provide that the drive of the fuel pump on the internal combustion engine side of the camshaft
Kurbelwelle, einem Zahnriemen, einem Keilriemen, einer Steuerkette, dem Wasserpumpen- oderCrankshaft, a timing belt, a V-belt, a timing chain, the water pump or
Lichtmaschinenantrieb oder der Kraftstoffhochdruckpumpe eines Kraftstoffemspritzsystems erfolgt, so dass eine optimale Anpassung der Fordermenge der Kraftstoffpumpe möglich wird. Beispielsweise dreht die Nockenwelle nur mit der halben Kurbelwellendrehzahl, so dass, e nachdem von welcher Welle die Kraftstoffpumpe angetrieben wird, die Drehzahl sich um den Faktor 2 unterscheidet. Durch den Antrieb der Kraftstoffpumpe über einen Zahnriemen, einen Keilriemen oder eine Steuerkette kann das Verhältnis der Drehzahlen von Brennkraftmaschine und Kraftstoffpumpe nahezu stufenlos gewählt werden. Ein weiteres Kriterium für die Wahl des brennkraftmaschinenseitigen Antriebs derAlternator drive or the high-pressure fuel pump of a fuel injection system takes place, so that an optimal adjustment of the demand of the fuel pump is possible. For example, the camshaft only rotates at half the crankshaft speed, so that, depending on which shaft the fuel pump is driven by, the speed differs by a factor of 2. By driving the fuel pump Using a toothed belt, a V-belt or a timing chain, the ratio of the engine and fuel pump speeds can be selected almost continuously. Another criterion for the choice of the drive of the internal combustion engine
Kraftstoffpumpe können auch die baulichen Gegebenheiten im Bereich der Brennkraftmaschine oder die möglichst einfache Montage sein.Fuel pumps can also be the structural conditions in the area of the internal combustion engine or the simplest possible assembly.
Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Zeichnung, deren Beschreibung und den Patentansprüchen entnehmbar.Further advantages and advantageous embodiments of the invention can be found in the following drawing, its description and the patent claims.
Zeichnungdrawing
In der beiliegenden Figur ist schematisch ein erfindungsgemaßes Kraftstoffversorgungssystem mit einerIn the accompanying figure is a fuel supply system according to the invention with a
Brennkraftmaschine dargestellt.Internal combustion engine shown.
Beschreibung des AusfuhrungsbeispielsDescription of the exemplary embodiment
Eine Kraftstoffpumpe 1 ist auf ihrer Saugseite 3 mit einem Kraftstofftank 5 über eine erste Kraftstoffniederdruckleitung 7 hydraulisch verbunden. Die Druckseite 9 der Kraftstoffpumpe 1 ist über eine zweite Kraftstoffniederdruckleitung 11 mit einer Kraftstoffeinspritzpumpe 13 einer Brennkraftmaschine 15 hydraulisch verbunden. Überschüssiger, von der Kraftstoffpumpe 1 zur Brennkraftmaschine 15 geforderter Kraftstoff wird über eine Rücklaufleitung 17 wieder dem Kraftstofftank 5 zugeführt.A fuel pump 1 is hydraulically connected on its suction side 3 to a fuel tank 5 via a first low-pressure fuel line 7. The pressure side 9 of the fuel pump 1 is hydraulically connected to a fuel injection pump 13 of an internal combustion engine 15 via a second low-pressure fuel line 11. Excess fuel required by the fuel pump 1 to the internal combustion engine 15 is fed back to the fuel tank 5 via a return line 17.
Angetrieben wird die Kraftstoffpumpe 1 alternativ durch einen elektrischen Antrieb 19 oder eine Abtriebswelle 21 der Einspritzpumpe 13. Zwischen dem elektrischen Antrieb 19 und der Kraftstoffpumpe 1 ist ein erster Freilauf 23 vorgesehen. Zwischen der Brennkraftmaschine 15 bzw. der Abtriebswelle 21 der Einspritzpumpe 13 und der Kraftstoffpumpe 1 ist ein zweiter Freilauf 25 vorgesehen. Durch die Freilaufe 23 und 25 wird verhindert, dass die Kraftstoffpumpe 1 gleichzeitig von der Brennkraftmaschine 15 und dem elektrischen Antrieb 19 angetrieben wird. Außerdem wird eine Umkehr des Leistungsflusses von der Kraftstoffpumpe 1 zurThe fuel pump 1 is alternatively driven by an electric drive 19 or an output shaft 21 of the injection pump 13. A first freewheel 23 is provided between the electric drive 19 and the fuel pump 1. A second freewheel 25 is provided between the internal combustion engine 15 or the output shaft 21 of the injection pump 13 and the fuel pump 1. The freewheels 23 and 25 prevent the fuel pump 1 from being driven simultaneously by the internal combustion engine 15 and the electric drive 19. In addition, a reversal of the power flow from the fuel pump 1 to
Brennkraftmaschine 15 oder von der Kraftstoffpumpe 1 zum elektrischen Antrieb 19 verhindert.Internal combustion engine 15 or from the fuel pump 1 to the electric drive 19 prevented.
Der elektrische Antrieb 19 wird beim Starten der Brennkraftmaschine 15 angesteuert. Dadurch ist derThe electric drive 19 is activated when the internal combustion engine 15 is started. This is the
Forderstrom der Kraftstoffpumpe 1 unabhängig von der Drehzahl der Brennkraftmaschine 15, so dass diese rasch mit ausreichend Kraftstoff versorgt wird. Dies ist besonders von Bedeutung, wenn der Tank leergefahren wurde oder der Tank zum ersten Mal beim Kfz-Hersteller gefüllt wird.Demand flow of the fuel pump 1 regardless of the speed of the internal combustion engine 15, so that it is quickly supplied with sufficient fuel. This is particularly important if the tank has been emptied or the tank is being filled for the first time by the vehicle manufacturer.
Sobald die Brennkraftmaschine 15 mit ausreichend hoher Drehzahl lauft, wird der elektrische Antrieb 19 stromlos geschaltet und die Kraftstoffpumpe 1 von der Brennkraftmaschine 15 angetrieben. Dadurch ergibt sich ein dem Kraftstoffverbrauch der Brennkraftmaschine 15 entsprechender Forderstrom der Kraftstoffpumpe 1, so dass nur wenig Kraftstoff über die Kraftstoffrucklaufleitung 17 von der Brennkraftmaschine 15 bzw. der Kraftstoffemspritzpumpe 13 m den Tank 5 zurückgeführt werden muss. Im Ergebnis fuhrt das erfmdungsgemaße Kraftstoffversorgungssystem zu einem sehr guten Startverhalten der Brennkraftmaschine 15 auch unter schwierigen Bedingungen und einer Verringerung des Antriebsleistungsbedarfs der Kraftstoffpumpe 1 wahrend des Betriebs der Brennkraftmaschine 15, so dass der Kraftstoffverbrauch der Brennkraftmaschine 15 entsprechend zurückgeht.As soon as the internal combustion engine 15 runs at a sufficiently high speed, the electric drive 19 is switched off and the fuel pump 1 is driven by the internal combustion engine 15. This results in a demand flow of the fuel pump 1 corresponding to the fuel consumption of the internal combustion engine 15, so that only a small amount of fuel has to be returned to the tank 5 via the fuel return line 17 from the internal combustion engine 15 or the fuel injection pump 13 m. As a result, the fuel supply system according to the invention leads to very good starting behavior of the internal combustion engine 15 even under difficult conditions and one Reduction of the drive power requirement of the fuel pump 1 during the operation of the internal combustion engine 15, so that the fuel consumption of the internal combustion engine 15 decreases accordingly.
Aufgrund der gegenüber der Betriebsdauer der Brennkraftmaschine deutlich reduzierten Betriebsdauer des elektrischen Antriebs, kann dieser so ausgelegt werden, dass er auch bei etwa halber Nennspannung des Bordnetzes noch funktionsfähig ist. Dadurch wird, auch wenn die Starterbatterie schwach oder aufgrund niedriger Temperaturen ihre Leistungsfähigkeit reduziert ist, noch eine ausreichende Forderleistung der Kraftstoffpumpe erzielt.Due to the significantly reduced operating time of the electric drive compared to the operating time of the internal combustion engine, it can be designed in such a way that it is still functional even at approximately half the rated voltage of the vehicle electrical system. As a result, even if the starter battery is weak or its performance is reduced due to low temperatures, the fuel pump still delivers sufficient power.
Der brennkraftmaschinenseitige Antrieb der Kraftstoffpumpe 1 durch eine Abtriebswelle 21 der Kraftstoffeinspritzpumpe 13 ist nur eine Möglichkeit des Antriebs von vielen. Der Antrieb der Kraftstoffpumpe 1 kann brennkraftmaschinenseitig auch von der Nockenwelle, der Kurbelwelle, einem Zahnriemen, einem Keilriemen, einer Steuerkette, dem Wasserpumpenoder Lichtmaschinenantrieb erfolgen. Durch die geeignete Wahl des brennkraftmaschinenseitigen Antriebs kann eine optimale Anpassung der Fordermenge derThe engine-side drive of the fuel pump 1 by means of an output shaft 21 of the fuel injection pump 13 is only one possibility of driving many. The fuel pump 1 can also be driven on the internal combustion engine side by the camshaft, the crankshaft, a toothed belt, a V-belt, a timing chain, the water pump or alternator drive. Through the suitable choice of the drive on the internal combustion engine, an optimal adjustment of the demand of the
Kraftstoffpumpe oder die baulichen Gegebenheiten im Bereich der Brennkraftmaschine sowie die Vereinfachung der Montage sein.Fuel pump or the structural conditions in the area of the internal combustion engine and the simplification of assembly.
Alle in der Beschreibung, den nachfolgenden Ansprüchen und der Zeichnung dargestellten Merkmale können sowohl einzeln als auch in beliebiger Kombination miteinander erfindungswesentlich sein. All the features shown in the description, the following claims and the drawing can be essential to the invention both individually and in any combination with one another.

Claims

Ansprüche Expectations
1. Kraftstoffversorgungssystem für1. Fuel supply system for
Brennkraftmaschinen ( ) mit einer elektrisch angetriebenen Kraftstoffpumpe (1), wobei die Saugseite (3) der Kraftstoffpumpe (1) hydraulisch mit einem Kraftstofftank (5) in Verbindung steht und wobei die Druckseite (9) der Kraftstoffpumpe (1) mit derInternal combustion engines () with an electrically driven fuel pump (1), the suction side (3) of the fuel pump (1) being hydraulically connected to a fuel tank (5) and the pressure side (9) of the fuel pump (1) being connected to the
Brennkraftmaschine (13, 15) hydraulisch in Verbindung steht, dadurch gekennzeichnet, dass die Kraftstoffpumpe (1) alternativ von der Brennkraftmaschine (15) angetrieben wird.Internal combustion engine (13, 15) is hydraulically connected, characterized in that the fuel pump (1) is alternatively driven by the internal combustion engine (15).
2. Kraftstoffversorgungssystem nach Anspruch 1, dadurch gekennzeichnet, dass der elektrische Antrieb2. Fuel supply system according to claim 1, characterized in that the electric drive
(19) der Kraftstoffpumpe (1) ein burstenloser Elektromotor ist.(19) the fuel pump (1) is a brushless electric motor.
3. Kraftstoffversorgungssystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der elektrische Antrieb (16) bei halber Nennspannung des Bordnetzes noch funktionsfähig ist.3. Fuel supply system according to claim 1 or 2, characterized in that the electric drive (16) is still functional at half the rated voltage of the electrical system.
4. Kraftstoffversorgungssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen dem elektrischen Antrieb (19) und der Kraftstoffpumpe (1) ein erster Freilauf (23) angeordnet ist. 4. Fuel supply system according to one of the preceding claims, characterized in that a first freewheel (23) is arranged between the electric drive (19) and the fuel pump (1).
5. Kraftstoffversorgungssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen der Brennkraftmaschine (15) und der Kraftstoffpumpe (1) ein zweiter Freilauf (25) angeordnet ist.5. Fuel supply system according to one of the preceding claims, characterized in that a second freewheel (25) is arranged between the internal combustion engine (15) and the fuel pump (1).
6. Kraftstoffversorgungssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Antrieb der Kraftstoffpumpe (1) brennkraftmaschmenseitig von der Nockenwelle, der Kurbelwelle, einem Zahnriemen, einem Keilriemen, dem Wasserpumpen- oder Lichtmaschinenantrieb oder der Kraftstoffhochdruckpumpe (13) eines Kraftstoffeinspπtzsystems erfolgt.6. Fuel supply system according to one of the preceding claims, characterized in that the fuel pump (1) is driven on the internal combustion engine side by the camshaft, the crankshaft, a toothed belt, a V-belt, the water pump or alternator drive or the high-pressure fuel pump (13) of a fuel injection system.
7. Kraftstoffversorgungssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Kraftstoffpumpe (1) eine Rollenzellenpumpe oder eine Zahnradpumpe ist. 7. Fuel supply system according to one of the preceding claims, characterized in that the fuel pump (1) is a roller cell pump or a gear pump.
EP00988691A 1999-12-29 2000-12-08 Fuel supply system for an internal combustion engine with a hybrid fuel pump Withdrawn EP1247020A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19963719A DE19963719A1 (en) 1999-12-29 1999-12-29 Fuel supply system for an internal combustion engine with a hybrid fuel pump
DE19963719 1999-12-29
PCT/DE2000/004368 WO2001050012A1 (en) 1999-12-29 2000-12-08 Fuel supply system for an internal combustion engine with a hybrid fuel pump

Publications (1)

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EP1247020A1 true EP1247020A1 (en) 2002-10-09

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EP00988691A Withdrawn EP1247020A1 (en) 1999-12-29 2000-12-08 Fuel supply system for an internal combustion engine with a hybrid fuel pump

Country Status (7)

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US (1) US6694951B2 (en)
EP (1) EP1247020A1 (en)
JP (1) JP2003519335A (en)
KR (1) KR20020062996A (en)
BR (1) BR0016779A (en)
DE (1) DE19963719A1 (en)
WO (1) WO2001050012A1 (en)

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Publication number Publication date
WO2001050012A1 (en) 2001-07-12
JP2003519335A (en) 2003-06-17
DE19963719A1 (en) 2001-07-12
US20030121503A1 (en) 2003-07-03
US6694951B2 (en) 2004-02-24
KR20020062996A (en) 2002-07-31
BR0016779A (en) 2002-08-27

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